Improvement in jet-pipes for gas-lamps



' Patented Oct.Z, 1877.

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- UNITED STATES PATENT OFFICE.

GEORGE JOHNSON, OF BUFFALO, NEW YORK.

IMPROVEMENT IN JET-PIPES FOR GAS-LAMPS.

Specification forming part of Letters Patent No. 195,714, dated October2, 1877; application filed May 9, 1877.

To all whom it may concern:

Be it known that I, GEORGE JOHNSON, of Buffalo, in the county of Erieand State of New York, have invented certain new and useful improvementsin pipes for connecting gas jets or burners with the gas-conducting pipewhere electricity is used for lighting, of which the following is aspecification:

This invention is intended to be used in connection with gas-lights instreets or in large buildings, or other places where electricity is ormay be used for lighting a number of burners simultaneously; and theinvention consists in arranging between the burner or jets and thegas-conducting pipe a bent or curved pipe, the object to be hereinafterfully explained.

In the drawings, Figures 1 and 2 represent side elevations of a singleburner connected by a curved pipe to the usual gas-pipe, and showingalso the wires by which the burner is to be lighted by electricity.

D represents the burner; A B, the curved pipe, and G the usualgas-conducting tube.

The object of this curved portion of the pipe is to do away with allindividual stopcocks to burners or jets, and to allow, where electricityis used to light the gas, the flow to be cut oil or pressure to be puton by a single cock, either at the gas-works or in any other suitableplace, or, in the case of a large city, several may be used, each oneshutting off or turning on the gas for a whole district or division.

Its arrangement is as follows: One end of the curved pipe is attachedto, or forms part of, the main pipe 0, and runs up a short distance andis curved over, as shown at A; then, running down, is bent again (shownat B) and carried upward, and ending in an upright jet or burner, D, asshown. This exact running of the pipe, however, is not material. It isthe curves and the descending part that prevent the escape of the gasafter the flow has been shut off at the starting-point.

The descending portion of the pipe between the curves A and B may bemade much shorter than shown without impairing its efficiency inretaining the gas. Only that small amount of gas escapes that was in thelast length of the curve fiom B to the burner D, the pressure of the airoutside into the burner and pipe also preventing the escape of gasexcept when the pressure is on at the main stopcock. When the pressureis oil", the gas remains in the pipes without escape.

This is a very simple arrangement, and will do away with all labor inopening and shutting individual stop-cocks, as it obviates theseentirely where lighting by electricity is used.

I propose to arrange the wires for lighting inside instead of outsidethe usual pipe 0, but coming one each side where the curved pipe is set,and each running up by the side of the curved pipe and through ashoulder in connection with the burner, as shown.

The utility of my invention is based on the philosophical principle thatall gases which are lighter than atmospheric air will ascend when leftfree in the air.

It is not claimed that the curves A and B of themselves prevent theescape of gas from the conducting tube below them; but they may be madein any shape that will form a descending portion of pipe between them.Through this descending portion the gas will not pass unless it isforced down by pressure of gas from the source of supply. As soon asthis pressure is shut off at the main or central stop-cock theatmospheric air, being heavier than gas, will press in at the burner D,as the gas escapes through it from B, and will fill this portion of thejet-pipe and also the curve B, forming here a complete obstruction tothe passage of the gas. This has been demonstrated by actual experimentby me.

I claim as my invention- 1. The curved pipe A B, placed intermediatebetweenthe burner or jet D and gas-conducting pipe 0, substantially asand for the purpose specified.

2. The bent pipe A B, forming a part of the gas-pipe O, terminating in agas burner or burners, and curved so as to obtain the descending portionbetween A and B, substantially as and for the purpose specified.

GEORGE JOHNSON.

Witnesses P. W. DORRIT, L. B. SMITH.

